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STM8S bảng dữ liệu(PDF) 125 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  STM8S Series and STM8AF Series 8-bit microcontrollers
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STM8S bảng dữ liệu(HTML) 125 Page - STMicroelectronics

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RM0016
Independent watchdog (IWDG)
127
Timeout period
The timeout period can be configured through the IWDG_PR and IWDG_RLR registers. It
is determined by the following equation:
where:
T = Timeout period
TLSI = 1/fLSI
P = 2 (PR[2:0] + 2)
R = RLR[7:0]+1
The IWDG counter must be refreshed by software before this timeout period expires.
Otherwise, an IWDG reset will be generated after the following delay has elapsed since the
last refresh operation:
D = T + 6 x TLSI
where D= delay between the last refresh operation and the IWDG reset.
Table 28. Watchdog timeout period (LSI clock frequency = 128 kHz)
Prescaler divider
PR[2:0] bits
Timeout
RL[7:0]= 0x00
RL[7:0]= 0xFF
/4
0
62.5 µs
15.90 ms
/8
1
125 µs
31.90 ms
/16
2
250 µs
63.70 ms
/32
3
500 µs
127 ms
/64
4
1.00 ms
255 ms
/128
5
2.00 ms
510 ms
/256
6
4.00 ms
1.02 s
T2
TLSI P
×
R
×
×
=



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